novumZ: Sounds Familiar, I'm getting fed up with wasting my time, cdpr release proper windows 7 version!
I figured I should give a an update. My Windows install is still broken. The disk eventually started throwing SMART errors (no surprises, that drive is about eight years old), so I ordered a replacement and tried Linux.
After a few days of attempts, I was able to get CP2077 sort-of running on Linux. It starts, but it crashes a lot. It is guaranteed to crash when you go to the elevator in the Corpo FemV start, and when it crashes here it's guaranteed to lock up Cinnamon (my desktop environment) so badly that your only hope of turning it off without the power button is to Control+Alt+Backspace to restart Cinnamon. I haven't tried any of the other starts, because I want to play as a a Corpo. All of the lighting effects I've found so far cycle between dim and bright at a constant ~1-3Hz (speed changes depending on graphics settings and unknown variables), which is really annoying given the copious bloom the game has.
If you want to try your luck, my setup for the Linux partition is Linux Mint 20 Cinnamon edition. /home is on a separate partition. You need to add the official Lutris PPA and use the community install script for Cyberpunk 2077. I was unsuccessful at starting CP2077 through PlayOnLinux or manually with Wine, Proton, Steam's "add a third party game" feature, or patched versions of Wine or Proton. You may or may not need to install the Oibaf PPA for an updated graphics stack, I had installed it before because I was told it was necessary to run CP2077 through Proton via Steam but I don't know if it's necessary for the Lutris install method. If you've never used Linux and are ready to try running Cyberpunk on it, note that Ubuntu 20.04 and Linux Mint 20 are basically the same OS and instructions for one almost always work on the other.
Note: Mint 20 seems to have an issue where the system can lock up so badly that Control-Alt-Backspace doesn't work, switching to a tty (Control-Alt-F1-F6, F7 brings you back to GUI) doesn't work, and even Magic SysRq (hold left Alt and Sysrq/PrintScreen, then type REISUB [Reboot Even If System Utterly Broken/Raising Elephants Is So Utterly Boring/Busier backwards] one key every few seconds) doesn't work. For me it mostly happens when you load the GPU heavily, then unload it, switch away from/exit from a fullscreen application, or change the screen resolution, but other users with this problem seem to have different causes and sometimes even slightly different symptoms and side effects. The monitor will still display while it's locked up.
I don't know if leaving it locked up like this is bad for your hardware, but I suggest holding POWER if you can't Control-Alt-Backspace or Magic SysRq. The problem acts like a thermal issue in that you're more likely to lock up again on boot or login if you turn the PC back on immediately and very unlikely if you give it a few minutes, but all the temperature sensors show normal values, both in BIOS and in the OS, plus this problem seems to only happen in Mint 20 and not Mint 18 or Windows.